I have a PII 350 machine. When I access the volume control, then go to the advanced tab, there is a box with tone controls (bass and treble). I am unable to activate this box. there is a checkmark in the 3D effects but whether it is checked or not doesn't make a difference. How can I solve this? I've called Microsoft and the tech guy had no clue. Didn't want to call again and run up another charge for a no answer. thanks.